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  #13  
Old 12-18-2011, 06:58 AM
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Re: Cabin temp

This is getting very strange. The problem is speed related, or maybe engine speed related. If the problem was a restriction in the heatercore lines, you would also have it at lower speeds. It looks almost if the coolant flow to the heater core gets less, or the blend doors are closing, but that should have no connection to the vehicle speed. Did you already select max temperature when driving on the highway? As soon as you slow down, the temperature gets higher again?
Just after the heatercore was replaced, the system was working properly?
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  #14  
Old 12-25-2011, 09:35 PM
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Re: Cabin temp

Did not have code after disconnecting the battery. Is there a valve somewhere from the radiator to the heater core I can check ?
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  #15  
Old 12-25-2011, 10:03 PM
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Re: Cabin temp

[QUOTE=Bob W;540246]Did not have code after disconnecting the battery. Is there a valve somewhere from the radiator to the heater core I can check ? Heat worked very well after new core. slower speed warmer, higher speeds starts to drop in temp????????????????????
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  #16  
Old 12-25-2011, 10:15 PM
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Re: Cabin temp

Im assuming in Ohio its pretty cold right now.... a broken recirc door would allow it to constantly pull fresh ice cold air from outside instead of circulating interior air, if you can try holding up the recirc door and prevent it from pulling outside air with the vehicle running and doors closed and see if that helps your situation... ultimately you may have a plugged/partially plugged/ sludged up heater core preventing proper heat transfer.
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  #17  
Old 12-26-2011, 01:34 PM
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Re: Cabin temp

There is no valve in the lines to the heater core, the fluid allways circulates through the core as soon as the engine is running.
Did you check the heater lines in the engine bay for any kink or sharp bend, which could restrict the fluid flow?
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